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src/Scanner/__Libraries/StellaOps.Scanner.Reachability/ReachabilityGraphBuilder.cs

@@ -54,6 +54,21 @@ public sealed class ReachabilityGraphBuilder
         return JsonSerializer.Serialize(payload, options);
     }
 
+    public ReachabilityUnionGraph ToUnionGraph(string language)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(language);
+
+        var nodeList = nodes
+            .Select(id => new ReachabilityUnionNode(id, language, "symbol"))
+            .ToList();
+
+        var edgeList = edges
+            .Select(edge => new ReachabilityUnionEdge(edge.From, edge.To, edge.Kind))
+            .ToList();
+
+        return new ReachabilityUnionGraph(nodeList, edgeList);
+    }
+
     public static ReachabilityGraphBuilder FromFixture(string variantPath)
     {
         ArgumentException.ThrowIfNullOrWhiteSpace(variantPath);